Il A heavy ball with a weicht of 100 N (m 10.2 kg) is hung. from the ceiling of a lecture hall on a 4.5-m-long rope. The ball. is pulled to one side and released to swing as a pendulum, reach-. ing a speed of 5.5 m/s as it passes throuoh the lowest point.
Inventions. The huochong gun was invented in China during the Ming dynasty. It was also called the tongjiangjun, which meant bronze general. This was an important invention of the time period because the Ming Dynasty was creating weapons to defend their dynasty, and they came across the gun.t was also called the tongjiangjun, which meant bronze general. This was an important invention of the time period because the Ming Dynasty was creating weapons to defend their dynasty, and they came across the gun.
The teapot probably derived from the ceramic kettles and wine pots which were also made in bronze and other metals and were a feature of Chinese cultural life for thousands of years. The teapot was invented during the Yuan Dynasty, tea preparation in previous dynasties did not utilize a teapot.In the Tang Dynasty, a cauldron was used to boil ground tea, which was served in bowls. Song Dynasty tea was made by pouring water boiled using a kettle into a bowl with finely ground tea leaves.he teapot was invented during the Yuan Dynasty, tea preparation in previous dynasties did not utilize a teapot. In the Tang Dynasty, a cauldron was used to boil ground tea, which was served in bowls. Song Dynasty tea was made by pouring water boiled using a kettle into a bowl with finely ground tea leaves.